Slotted type mechanical pencil



D. SPIRIDI" 2,229,193 I SLOT'rED TYPE MECHANICAL PENCIL H Jan. 21, 1941.

Filed Jan. 23, 1940' Mr 6 2 4 934 w 1 f// L,

INVENTORI UNITED S A T-omen-. SLOTTED mnffz r iimcar. rnivcn. v

Michael D. Spiridi, Railway, N. J. Application January 23, 1940, Serial No. 315,143

2 Claims.

My invention relates to a mechanical pencil and the object of my invention is to provide a new and improved mechanical pencil of simple, durable, and inexpensive construction.

In both forms of my invention I usea short internally screw threaded intermediate cylinder,

with extended arms from its side in the slots of an unthreaded and vertically double slotted outer cylinder, by turning the same, both cylinders correspondingly will move to the same direction for the reception. of a correspondingly externally threaded and vertically double slotted inner cylinder, will provide a tightening screw pressure against the arms of the lead holder in the slots of the inner cylinder, simultaneously moving the lead out at the point of the pencil. And an expansion of a light coil spring, circumferentially and vertically adapted around the inner cylinder, to hold upward the lead carriers arm, and

preventing same from dropping out of the cylinder, simultaneously to raise the lead and thelead carrier upward pressure is released.

when the tightening screw The one end of the unthreaded, but vertically double slotted outer cylinder may be connected from the upper end of the pencil barrel to a ferrule or to the lower member point, as conveniently the same may be turned from that end.

With these and other objects in view, my invention consists in the construction and arrangement of the various parts of the device, whereby the objects contemplated are attained, as set forth in the descrip my claims, and in tion, distinctly set forth in the drawing accompanying this specification and forming a part of my application, I have shown for purposes of illustration, one form of my invention in slotted mechanical pencil, which my invention may assume.

In this drawing:

Fig. 1 is a vertical section through the preferred form of my mechanical pencil. I

Fig. 2 is a view similar to Figure 1 at an angle thereto.

Fig. 3 is a cross-section on line 3-3 of Figure 1.

Fig. 4 is a longitudinal sectional view of a modified form of the mechanical pencil.

Fig. 5 is a cross-section on line 5-5 of Fig. 4..

respondingly interna termediate cylinder 11y screw threaded short in- 3 with its extended arms 4 (c1. 12a-1s) functioning in the slots 5 of a vertically double slotted but unthreaded outer cylinder 8. In coaction with the said cylinder, by turning the same, depending upon the direction in which the said cylinder 6 is turned correspondingly will I turn the short internally threaded intermediate cylinder 3 to provide upwardly or downwardly motion to the intermediate cylinder 3, thus producing a tightening screw pressure against the lead carrier's arm 1 in the slot 8 of the inner cylinder Ito produce a forward motion to the lead carrier 9 and the lead I0. A light coil expansion spring II is provided circumferentially covered around the inner cylinder l to hold upward the said arms 'I of the lead carrier 9, thus preventingthe lead holder and the lead from dropping out of the cylinder; and the same also is provided to raise the lead carrier with the lead upward, when the tightening screw pressure is released. The one end of the outer cylinder 6 may be connected with a ferrule l2 or to the lower point portion iii of the pencil barrel, which conveniently may be turned from that end.

The main body of the pencil barrel may be made of Bakelite or other composition or metal.

While I have shown one embodiment of my invention, for the purpose of describing the same and illustrating its principles of construction and operation, it is apparent that various changes and modifications may be made therein, without departing from the spirit of my invention, and I desire, therefore, that only such limitation, shall be imposed therein as are indicated in the appended claims or as are demanded by the prior art.

I claim:

1. A mechanical pencil as described, comprising a pencil barrel, three telescoping cylinders in said barrel, an inner, externally threaded and slotted lead holding cylinder, and a short, intermediate internally threaded cylinder engaging said inner cylinder, and an outer, smooth and slotted cylinder into which said inner and intermediate cylinders telescope, arms on said short intermediate cylinder engaging in the slots of said outer cylinder, means to hold said inner cylinder stationary; means on said outer cylinder projecting beyond one end of the barrel to rotate the same to screw the intermediate cylinder over the inner cylinder, a lead carrier within the inner cylinder having arms projecting out through the slots in said inner cylinder, and a spring guided about the inner cylinder and pressing up against the arms of the lead carrier whereby the pressure of said spring on the arms will regulate the extension and retraction of the lead.

2. A mechanical pencil as described, comprising a pencil barrel, three telescoping cylinders in said barrel, an inner, externally threaded and slotted lead holding cylinder, and a short, intermediate, internally threaded cylinder engaging said inner cylinder, and an outer smooth and slotted cylinder into which said inner and inter mediate cylinders telescope, an arm on said short intermediate cylinder engaging in a slot 01' said outer cylinder, means to hold said inner cylinder stationary, means on said outer cylinder projecting beyond one end of the barrel to rotate the same to screw the intermediate cylinder over the inner cylinder, a lead carrier within the inner cylinder having an arm projecting out through a slot in said inner cylinder, and a. spring guided. about the inner cylinder and pressing against the arm oi the lead carrier whereby the pressure of said spring on the arm will regulate the extension and retraction o! the lead.

MICHAEL D. SPIRIDI. 

